Replaceable scriber point



Oct. 15, 1957 T. P. KUZMA 2,809,437

REPLACEABLE SCRIBER POINT Filed April 22,1954

nite States Patent REPLACEABLE SCRIBER POINT Thomas P. Kuzma, Detroit, Mich.

Application April 22, 1954, erial No. 424,961

6 Claims. (Cl. 33-149) The present invention relates to replacement points for such instruments as scribers, dividers, or the like, and it is particularly designed for metal scribers in which the points become readily worn and dull from use.

In certain of the metal arts, metal smiths, layout men, die makers and the like are required to scribe on metal. This results in the points of the scribing instruments becoming dull quite rapidly, necessitating new points being ground on the instruments, which has the effect of shortening the lengths of the same until they eventually are too short to be of value. Furthermore, such steps of sharpening the points are time consuming for the workmen, and there are not always facilities present for carrying out such an operation. In other instances, it is difficult to sharpen the instruments because of their irregular shape, thus being particularly true in connection with dividers, odd shaped scriber handles or the like. Such irregular shape makes it difficult to twirl the instrument evenly against the grinding wheel which is necessary to obtain a sharp conical point.

Efforts have been made in various ways to overcome the defects of the prior art devices. In some instances the scribing instruments have been made of higher grade steels which have increased their costs, and even such instruments have been subject to wear when used in conjunction with hard metals. In other instances the instruments have had new points added but until the present invention was developed none have proved to be successful.

it is the principal object of the present invention to provide replacement points for instruments such as scribers, or the like, such replacement points being constructed and arranged so that they can be easily secured in place over the worn scriber point, and when so fastened will provide a point which is superior to the point that originally was on such scriber.

It is another object of the present invention to provide a replacement point of the foregoing character in which the tip is formed from a relatively hard metal in the order of high speed steels, carbides or the like and means are provided for fastening and holding said tip on the end of a scriber.

It is still another object of the present invention to provide a replacement point of the foregoing character which includes a sleeve containing at one end a pointed hard metal and which is adapted to have its other end fitted over the end of a scriber and to be rigidly attached thereto, said sleeve being removable from such scriber in the event the tip of such sleeve should become damaged or in any other way ineffective as a scriber point.

It is still another object of the invention to provide a scriber having a removable pointed end so that the latter may be replaced should the necessity arise.

Other objects of this invention will appear in the following description and appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

to be understood that the invention is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of other embodiments and of being practiced or carried out in various ways. Also, it is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.

Referring now to the drawings, a more detailed description of the present invention will be given. Fig. 1 shows one form of a scriber it? to which a replacement point 12, embodying the present invention, is being installed on the end 14 of the leg 16. The other leg 18 has had its end 20 sharpened to a new point by a grinding operation in the manner conventionally employed heretofore. In order to facilitate the operation of attaching the replacement point 12 to the leg 16, the worn point has been ground to form the blunt end 14.

The replacement point 12 is formed from a sleeve 22 which has a tip 24 driven into its one end so as to be permanently attached. The tip 24 may be formed from any well known type of sintered carbide such as tungsten carbide, or if desired it may be made of high speed steel or the like. The tip 24 can also be fastened to the sleeve 22 by a brazing or soldering operation, and it should be understood that the invention is not limited in scope to the material forming the tip 24 nor to the precise manner of securing the same in the sleeve 22.

Referring to Fig. 3, it will be seen that the open end of sleeve 22 is flared outwardly so as to fit more easily over the tapered leg of the scriber. Thus, when it is desired to install the replacement point 12 on the leg 16, the two parts can be secured together by any suitable means, such as by brazing, soldering or the like. While it is contemplated that these parts can be threadedly connected together, it is preferred that a soldering operation be used when one of the points 12 is to be attached to a worn conventional type of scriber. Under these circumstances it is found to be much easier to solder the parts together than it is to thread the end of the scriber.

The operation of soldering the parts together can be carried out in a very simple manner. Any type of cigarette lighter, for example, such as is shown at 26 in Fig. 1 may be used to head the end 14 of the leg 16 and also to heat the replacement point 12. A small amount of flux and solder having a low melting point can be placed in the open end of sleeve 22 prior to the heating operation so that after the mating parts have been heated sutiiciently to melt the solder, such parts can be pressed together and held in such position until the solder has solidified. The replacement point 12 will then be rigidly secured to leg 16 as shown in Fig. 2.

Thus, a very simple method is provided for joining the scriber leg with the replacement point, and such parts can be separated with equal facility should the need arise for replacement because of damage to the tip 24, or where it is necessary to remove the replacement point 12 for a regrinding operation. This may occur in connection with irregular or odd shaped instruments when it is desired to transfer the point to a twirling stern for carrying out the grinding operation. In removing the point it is merely necessary to reheat the sleeve 22 until the solder therein 2,809,437 7 I a e has been melted causing the replacement point 12 to drop from leg 16. t

In order to facilitate the soldering of the mating parts together, the solder and flux may be coated or lined on the inner walls 28 of sleeve 22 so that the metal smith who is adding the point 12 to his scriber will not be required to keep a supply of these materials on hand. It is contemplated that replacement points 12 will be prepared in this manner and will be packaged in small quantities, such as ten per package. The metal smith can then add sharpened, hardened points to his scribers at any time, the only instrument required for'this purpose being a cigarette lighter or some other type of heating material or equipment. 7

Having thus described my invention, I- claim:

.1. As an article of manufacture, a replacement point for scribers or the like comprising a sleeve open at one end and having inner walls converging from the open end 'toward said other end for a major portion of the length of the sleeve and thereafter flaring outwardly to the other end, an insert having a converging end portion fitting into the outwardly flared end of said sleeve and a pointed end projecting from said flared end.

2. As an article of manufacture, a replacement point for scribers or the like comprising a sleeve open at one end and having inner walls converging from the open tend toward the other end for a major portion of the length'of the sleeve and thereafter fiaring outwardly to the other end, an insert having a converging end portion brazed into the outwardly flared end of, said sleeve and a pointed end projecting from said flared end, said insert being formed from a relatively hard metallic material in therorder of sintered carbides.

3. As an article of manufacture, a replacement point for scribers or the like comprising a sleeve open at one end and having inner walls converging from the open end toward the other end for a major portion of the length of 4 7 end and having inner walls converging from the open end toward said other end for a major portion of the length of the sleeve and thereafter flaring outwardly to the other end, an insert having a converging end portion fitting into the outwardly flared end of said sleeve and a pointed end'projecting from said flared end, said sleeve having the converging portion of its inner walls coated with a low melting point solder.

5. In combination, a scriber having at least one tapered leg, and a replacement point fitted over the end of said leg, said replacement point comprising a sleeve having inner walls converging from one end toward the other end for a major portion of its length and there outwardly flared end of said sleeve and a the sleeve and thereafter flaring outwardly to the other 7 point solder.

4."As an article of manufacture, a replacement point for scribers or the like comprising a sleeve open at one after flaring outwardly to the other end, the converging portion of said inner Walls conforming in shape to the distal end of said tapered leg for receiving the latter, and an insert having a converging tend portion fitting into the pointed end projecting from said flared end.

6; in combination, a scriber having at least 'one tapered leg, and a replacement point fitted over the end of said leg, said replacement point comprising a sleeve having'inner walls converging from. one end toward the other end for a major portionof its length and thereafter flaring outwardly to the other end, the converging por-' tion of said inner walls conforming in shape to the distal References Cited in the file of this patent UNITED STATES PATENTS 50,037 Roessler Sept. 19, 1865 595,607 Coykendall Dec; 14, 1897 642,750 Nielsen Feb. 6, 1900 1,178,706 Diedrichs Apr. 11, 1916 2,060,872 Kraeuter Nov. 17, 1936 2,402,000 Young June 11, 1946' FOREIGN PATENTS 662,209 Great Britain Dec. 5, 1951 

